The banking and financial sectors are anxiously bracing for firebrand California Rep. Maxine Waters to claim the chairmanship of the House Financial Services Committee, unsure of what her leadership on the key panel will mean. Waters, a frequent and vocal critic of President Trump and his administration, is seen as one of Wall Street’s biggest adversaries in Congress thanks in large part to her calls for stricter rules on the nation’s biggest banks and opposition to moves from the White House to roll back financial regulations implemented during the last recession. She has toned down her rhetoric since the midterm...